Geology topics
Karen J. Wenrich-Verbeek
Publications and source records attributed to Karen J. Wenrich-Verbeek.
Major and trace element data with partition coefficients for lava flows from the San Francisco volcanic field
Major and trace element data from San Francisco Mountain (a stratovolcano), as well as major element data from representative flows of the surrounding volcanic field (figure 1), are presented in this report. Also included are conventional and normalized partition coefficients for trace elements in each of the coexisting mineral phases and mesostasis from San Francisco Mountain lavas. The San Francisco Mountain lavas are from the upper portion of the southeast slope of Humphreys Peak which is composed of three petrographically distinct types: (1) a lower series of hornblende pyroxene andesites, (2) a middle group of hypersthene dacites, and (3) an upper series of olivine andesites. The sequence of volcanic flows was measured and analyzed for the major elements and fifteen trace elements Sc, V, Cr, Cq Ni, Cu, Zn, Ga, Sr, Y, Zr, Ba, La, Ce, and Yb) in each of the coexisting mineral phases, groundmass and bulk rock. The constituent mineral phases (not all are present in every sample) are plagioclase, hypersthene, augite, hornblende, olivine, magnetite, and ilmenite/hematite.
The effectiveness of stream-sediment sampling along the Rio Ojo Caliente, New Mexico
No abstract available.
Bibliography of uranium and daughter products in water and associated sediments
Explore the source record for details and available documents.
Water and stream-sediment sampling techniques for use in uranium exploration
Methods of sampling water and stream sediments for uranium were established in this study. Water samples should be taken using a US DH-48 water sampler across the stream channel and should be filtered and acidified in situ. Stream sediments should be taken as a composite sample up and across the axis of the channel. Only sediment fractions less than 90 ?m (170 mesh) should be analyzed for uranium. The elements As, Ca, Al, B, Mg, K, and Na exhibit a positive correlation with uranium in surface waters, while a much larger suite of elements exhibit a positive correlation with uranium in stream sediments: K, Mn, Mg, Ti, Ca, Al, Fe, Pb, Cr, Y, Zr, Li, Zn, Th, and As. Analyses have revealed that anomalies detected in either the dissolved or suspended fractions of water, or the stream sediments, are frequently not reflected in the other two; hence, all three should be sampled and analyzed.